bin laden's secretary. and some intelligence analysts say he may be wanting to prove himself to try and exert himself on the international stage by carrying out some sort of terror attack in yemen or abroad. but not all u.s. diplomats are happy with this situation. they say there needs to be xurpt, but they also say they can't do their jobs if they're locked behind big walls like this one. lester? >> richard engel reporting from cairo. let's bring in our chief foreign affairs correspondent andrea mitchell. andrea, we know from previous experience the u.s. can't maintain this red alert posture indefinitely so what's the plan going forward here? >> it really is day by day. the intelligence of an impending attack as you're reporting is serious but they still don't know the specific target. there are several other threats, possibility for the retaliation for the drone strike richard just mentioned and a threatening speech last week by ayman al zawahiri. the upcoming anniversary this week of bombings of tanzania